spec/microblaze: Use configurable RAM size

When committed, the MicroBlaze RAM size was hard-coded to 16MB. This
changes the default to 256MB and sets the KCU105 BSPs to 2GB since that
is what the board has on it.

spec/build/bsps/microblaze/microblaze_fpga/grp.yml

@@ -33,6 +33,8 @@ links:
   uid: opticachesize
 - role: build-dependency
   uid: optintcbaseaddress
+- role: build-dependency
+  uid: optramlen
 - role: build-dependency
   uid: opttimerbaseaddress
 - role: build-dependency

spec/build/bsps/microblaze/microblaze_fpga/linkcmds.yml

@@ -35,7 +35,7 @@ content: |
   MEMORY
     {
         BRAM     (AIW) : ORIGIN = 0x00000000, LENGTH = 0x10000
-        RAM   : ORIGIN = _TEXT_START_ADDR, LENGTH = 0x1000000
+        RAM   : ORIGIN = _TEXT_START_ADDR, LENGTH = ${BSP_MICROBLAZE_FPGA_RAM_LENGTH}
     }
 
   REGION_ALIAS ("REGION_START", BRAM);

spec/build/bsps/microblaze/microblaze_fpga/optramlen.yml

@@ -0,0 +1,21 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+actions:
+- get-integer: null
+- assert-uint32: null
+- env-assign: null
+- format-and-define: null
+build-type: option
+copyrights:
+- Copyright (C) 2022 On-Line Applications Research (OAR)
+default: 0x10000000
+default-by-variant:
+- value: 0x80000000
+  variants:
+  - microblaze/kcu105.*
+description: |
+  length of memory area available to the BSP
+enabled-by: true
+format: '{:#010x}'
+links: []
+name: BSP_MICROBLAZE_FPGA_RAM_LENGTH
+type: build